xref: /dokuwiki/lib/exe/indexer.php (revision c4f79b71351dd0d96f19f7c5629888d85a814c72) 
1<?php
2/**
3 * DokuWiki indexer
4 *
5 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
6 * @author     Andreas Gohr <andi@splitbrain.org>
7 */
8if(!defined('DOKU_INC')) define('DOKU_INC',dirname(__FILE__).'/../../');
9define('DOKU_DISABLE_GZIP_OUTPUT',1);
10require_once(DOKU_INC.'inc/init.php');
11session_write_close();  //close session
12if(!defined('NL')) define('NL',"\n");
13
14// Version tag used to force rebuild on upgrade
15define('INDEXER_VERSION', 2);
16
17// keep running after browser closes connection
18@ignore_user_abort(true);
19
20// check if user abort worked, if yes send output early
21$defer = !@ignore_user_abort() || $conf['broken_iua'];
22if(!$defer){
23    sendGIF(); // send gif
24}
25
26$ID = cleanID($_REQUEST['id']);
27
28// Catch any possible output (e.g. errors)
29if(!isset($_REQUEST['debug'])) ob_start();
30
31// run one of the jobs
32$tmp = array(); // No event data
33$evt = new Doku_Event('INDEXER_TASKS_RUN', $tmp);
34if ($evt->advise_before()) {
35  runIndexer() or
36  metaUpdate() or
37  runSitemapper() or
38  sendDigest() or
39  runTrimRecentChanges() or
40  runTrimRecentChanges(true) or
41  $evt->advise_after();
42}
43if($defer) sendGIF();
44
45if(!isset($_REQUEST['debug'])) ob_end_clean();
46exit;
47
48// --------------------------------------------------------------------
49
50/**
51 * Trims the recent changes cache (or imports the old changelog) as needed.
52 *
53 * @param media_changes If the media changelog shall be trimmed instead of
54 * the page changelog
55 *
56 * @author Ben Coburn <btcoburn@silicodon.net>
57 */
58function runTrimRecentChanges($media_changes = false) {
59    global $conf;
60
61    $fn = ($media_changes ? $conf['media_changelog'] : $conf['changelog']);
62
63    // Trim the Recent Changes
64    // Trims the recent changes cache to the last $conf['changes_days'] recent
65    // changes or $conf['recent'] items, which ever is larger.
66    // The trimming is only done once a day.
67    if (@file_exists($fn) &&
68        (@filemtime($fn.'.trimmed')+86400)<time() &&
69        !@file_exists($fn.'_tmp')) {
70            @touch($fn.'.trimmed');
71            io_lock($fn);
72            $lines = file($fn);
73            if (count($lines)<=$conf['recent']) {
74                // nothing to trim
75                io_unlock($fn);
76                return false;
77            }
78
79            io_saveFile($fn.'_tmp', '');          // presave tmp as 2nd lock
80            $trim_time = time() - $conf['recent_days']*86400;
81            $out_lines = array();
82
83            for ($i=0; $i<count($lines); $i++) {
84              $log = parseChangelogLine($lines[$i]);
85              if ($log === false) continue;                      // discard junk
86              if ($log['date'] < $trim_time) {
87                $old_lines[$log['date'].".$i"] = $lines[$i];     // keep old lines for now (append .$i to prevent key collisions)
88              } else {
89                $out_lines[$log['date'].".$i"] = $lines[$i];     // definitely keep these lines
90              }
91            }
92
93            if (count($lines)==count($out_lines)) {
94              // nothing to trim
95              @unlink($fn.'_tmp');
96              io_unlock($fn);
97              return false;
98            }
99
100            // sort the final result, it shouldn't be necessary,
101            //   however the extra robustness in making the changelog cache self-correcting is worth it
102            ksort($out_lines);
103            $extra = $conf['recent'] - count($out_lines);        // do we need extra lines do bring us up to minimum
104            if ($extra > 0) {
105              ksort($old_lines);
106              $out_lines = array_merge(array_slice($old_lines,-$extra),$out_lines);
107            }
108
109            // save trimmed changelog
110            io_saveFile($fn.'_tmp', implode('', $out_lines));
111            @unlink($fn);
112            if (!rename($fn.'_tmp', $fn)) {
113                // rename failed so try another way...
114                io_unlock($fn);
115                io_saveFile($fn, implode('', $out_lines));
116                @unlink($fn.'_tmp');
117            } else {
118                io_unlock($fn);
119            }
120            return true;
121    }
122
123    // nothing done
124    return false;
125}
126
127/**
128 * Runs the indexer for the current page
129 *
130 * @author Andreas Gohr <andi@splitbrain.org>
131 */
132function runIndexer(){
133    global $ID;
134    global $conf;
135    print "runIndexer(): started".NL;
136
137    if(!$ID) return false;
138
139    // check if indexing needed
140    $idxtag = metaFN($ID,'.indexed');
141    if(@file_exists($idxtag)){
142        if(io_readFile($idxtag) >= INDEXER_VERSION){
143            $last = @filemtime($idxtag);
144            if($last > @filemtime(wikiFN($ID))){
145                print "runIndexer(): index for $ID up to date".NL;
146                return false;
147            }
148        }
149    }
150
151    // try to aquire a lock
152    $lock = $conf['lockdir'].'/_indexer.lock';
153    while(!@mkdir($lock,$conf['dmode'])){
154        usleep(50);
155        if(time()-@filemtime($lock) > 60*5){
156            // looks like a stale lock - remove it
157            @rmdir($lock);
158            print "runIndexer(): stale lock removed".NL;
159        }else{
160            print "runIndexer(): indexer locked".NL;
161            return false;
162        }
163    }
164    if($conf['dperm']) chmod($lock, $conf['dperm']);
165
166    // upgrade to version 2
167    if (!@file_exists($conf['indexdir'].'/pageword.idx'))
168        idx_upgradePageWords();
169
170    // do the work
171    idx_addPage($ID);
172
173    // we're finished - save and free lock
174    io_saveFile(metaFN($ID,'.indexed'),INDEXER_VERSION);
175    @rmdir($lock);
176    print "runIndexer(): finished".NL;
177    return true;
178}
179
180/**
181 * Will render the metadata for the page if not exists yet
182 *
183 * This makes sure pages which are created from outside DokuWiki will
184 * gain their data when viewed for the first time.
185 */
186function metaUpdate(){
187    global $ID;
188    print "metaUpdate(): started".NL;
189
190    if(!$ID) return false;
191    $file = metaFN($ID, '.meta');
192    echo "meta file: $file".NL;
193
194    // rendering needed?
195    if (@file_exists($file)) return false;
196    if (!@file_exists(wikiFN($ID))) return false;
197
198    global $conf;
199
200    // gather some additional info from changelog
201    $info = io_grep($conf['changelog'],
202                    '/^(\d+)\t(\d+\.\d+\.\d+\.\d+)\t'.preg_quote($ID,'/').'\t([^\t]+)\t([^\t\n]+)/',
203                    0,true);
204
205    $meta = array();
206    if(!empty($info)){
207        $meta['date']['created'] = $info[0][1];
208        foreach($info as $item){
209            if($item[4] != '*'){
210                $meta['date']['modified'] = $item[1];
211                if($item[3]){
212                    $meta['contributor'][$item[3]] = $item[3];
213                }
214            }
215        }
216    }
217
218    $meta = p_render_metadata($ID, $meta);
219    io_saveFile($file, serialize($meta));
220
221    echo "metaUpdate(): finished".NL;
222    return true;
223}
224
225/**
226 * Builds a Google Sitemap of all public pages known to the indexer
227 *
228 * The map is placed in the root directory named sitemap.xml.gz - This
229 * file needs to be writable!
230 *
231 * @author Andreas Gohr
232 * @link   https://www.google.com/webmasters/sitemaps/docs/en/about.html
233 */
234function runSitemapper(){
235    print "runSitemapper(): started".NL;
236    require_once DOKU_INC.'inc/sitemap.php';
237    $result = sitemapGenerate() && sitemapPingSearchEngines();
238    print 'runSitemapper(): finished'.NL;
239    return $result;
240}
241
242/**
243 * Send digest and list mails for all subscriptions which are in effect for the
244 * current page
245 *
246 * @author Adrian Lang <lang@cosmocode.de>
247 */
248function sendDigest() {
249    echo 'sendDigest(): start'.NL;
250    global $ID;
251    global $conf;
252    if (!$conf['subscribers']) {
253        return;
254    }
255    $subscriptions = subscription_find($ID, array('style' => '(digest|list)',
256                                                  'escaped' => true));
257    global $auth;
258    global $lang;
259    global $conf;
260    global $USERINFO;
261
262    // remember current user info
263    $olduinfo = $USERINFO;
264    $olduser  = $_SERVER['REMOTE_USER'];
265
266    foreach($subscriptions as $id => $users) {
267        if (!subscription_lock($id)) {
268            continue;
269        }
270        foreach($users as $data) {
271            list($user, $style, $lastupdate) = $data;
272            $lastupdate = (int) $lastupdate;
273            if ($lastupdate + $conf['subscribe_time'] > time()) {
274                // Less than the configured time period passed since last
275                // update.
276                continue;
277            }
278
279            // Work as the user to make sure ACLs apply correctly
280            $USERINFO = $auth->getUserData($user);
281            $_SERVER['REMOTE_USER'] = $user;
282            if ($USERINFO === false) {
283                continue;
284            }
285
286            if (substr($id, -1, 1) === ':') {
287                // The subscription target is a namespace
288                $changes = getRecentsSince($lastupdate, null, getNS($id));
289            } else {
290                if(auth_quickaclcheck($id) < AUTH_READ) continue;
291
292                $meta = p_get_metadata($id);
293                $changes = array($meta['last_change']);
294            }
295
296            // Filter out pages only changed in small and own edits
297            $change_ids = array();
298            foreach($changes as $rev) {
299                $n = 0;
300                while (!is_null($rev) && $rev['date'] >= $lastupdate &&
301                       ($_SERVER['REMOTE_USER'] === $rev['user'] ||
302                        $rev['type'] === DOKU_CHANGE_TYPE_MINOR_EDIT)) {
303                    $rev = getRevisions($rev['id'], $n++, 1);
304                    $rev = (count($rev) > 0) ? $rev[0] : null;
305                }
306
307                if (!is_null($rev) && $rev['date'] >= $lastupdate) {
308                    // Some change was not a minor one and not by myself
309                    $change_ids[] = $rev['id'];
310                }
311            }
312
313            if ($style === 'digest') {
314                foreach($change_ids as $change_id) {
315                    subscription_send_digest($USERINFO['mail'], $change_id,
316                                             $lastupdate);
317                }
318            } elseif ($style === 'list') {
319                subscription_send_list($USERINFO['mail'], $change_ids, $id);
320            }
321            // TODO: Handle duplicate subscriptions.
322
323            // Update notification time.
324            subscription_set($user, $id, $style, time(), true);
325        }
326        subscription_unlock($id);
327    }
328
329    // restore current user info
330    $USERINFO = $olduinfo;
331    $_SERVER['REMOTE_USER'] = $olduser;
332}
333
334/**
335 * Just send a 1x1 pixel blank gif to the browser
336 *
337 * @author Andreas Gohr <andi@splitbrain.org>
338 * @author Harry Fuecks <fuecks@gmail.com>
339 */
340function sendGIF(){
341    if(isset($_REQUEST['debug'])){
342        header('Content-Type: text/plain');
343        return;
344    }
345    $img = base64_decode('R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAEALAAAAAABAAEAAAIBTAA7');
346    header('Content-Type: image/gif');
347    header('Content-Length: '.strlen($img));
348    header('Connection: Close');
349    print $img;
350    flush();
351    // Browser should drop connection after this
352    // Thinks it's got the whole image
353}
354
355//Setup VIM: ex: et ts=4 enc=utf-8 :
356// No trailing PHP closing tag - no output please!
357// See Note at http://www.php.net/manual/en/language.basic-syntax.instruction-separation.php
358